EP1993292A1 - Procede de codage dynamique d'image et dispositif et programme l'utilisant - Google Patents

Procede de codage dynamique d'image et dispositif et programme l'utilisant Download PDF

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EP1993292A1
EP1993292A1 EP07738032A EP07738032A EP1993292A1 EP 1993292 A1 EP1993292 A1 EP 1993292A1 EP 07738032 A EP07738032 A EP 07738032A EP 07738032 A EP07738032 A EP 07738032A EP 1993292 A1 EP1993292 A1 EP 1993292A1
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Prior art keywords
motion vector
skip mode
block
mode
skip
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EP1993292A4 (fr
EP1993292B1 (fr
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Keiichi Chono
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NEC Corp
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NEC Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/103—Selection of coding mode or of prediction mode
    • H04N19/109—Selection of coding mode or of prediction mode among a plurality of temporal predictive coding modes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/132—Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/136—Incoming video signal characteristics or properties
    • H04N19/137—Motion inside a coding unit, e.g. average field, frame or block difference
    • H04N19/139—Analysis of motion vectors, e.g. their magnitude, direction, variance or reliability
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
    • H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
    • H04N19/61—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding in combination with predictive coding

Definitions

  • the present invention relates to a method of deciding validity of a skip MB mode in a moving picture encoding technique using motion-compensated prediction, which invention is suitably applicable to a moving picture encoding apparatus and a program using this method.
  • Non-patent Document 1 ISO/IEC 14496-10 Advanced Video Coding
  • JM Joint Model
  • the conventional moving picture encoding apparatus applies encoding processing to Macro Blocks (MB's) one by one in each input image frame to generate encoded data, i.e., a bit stream.
  • an MB refers to a cell of an input image frame divided in a grid-like manner, containing 16x16 luminance pixels and 8x8 Cr-Cb chrominance pixels ( FIG. 1 ).
  • the structure of an image frame is divided into a first field and a second field, and each field serves as an image frame subjected to encoding processing.
  • a conventional moving picture encoding apparatus for applying encoding processing to MB's is comprised of an MB buffer E101, a conversion apparatus E102, a quantization apparatus E103, an entropy coding apparatus E104, an inverse quantization/inverse conversion apparatus E105, a frame buffer E106, a prediction apparatus E107, a code-amount control apparatus E108, a motion vector calculating apparatus E109, and an MB mode deciding apparatus E110.
  • the MB buffer E101 stores therein an original image for an MB to be encoded.
  • a prediction method that provides satisfactory encoding of an MB to be encoded is selected for encoding from among a plurality of types of prediction methods.
  • the prediction methods are generally classified into two types: intra-frame prediction and inter-frame prediction.
  • Intra-frame prediction generates a predicted value from a reconstructed image of an image frame currently being encoded.
  • inter-frame prediction uses for prediction a reconstructed image of any one of a plurality of image frames encoded in the past.
  • a reconstructed image frame (reference frame) for use in inter-frame prediction is designated by an index ref_idx (reference index), and a position of a reconstructed image in the designated reconstructed image frame, which position serves as a source of a predicted value to be generated, is designated by a motion vector mv.
  • inter-frame prediction by designating a type of inter-frame prediction (by selecting an MB mode mb_mode corresponding to the type of inter-frame prediction), it is possible to define a reference index ref_idx and a motion vector mv for a unitary block, which is a sub-division of an MB, for transmission (see Non-patent Document 1: ISO/IEC 14496-10 Advanced Video Coding for further information).
  • a set of MB's (a slice) encoded only by intra-frame prediction is referred to as an I-slice, and a slice encoded by applying inter-frame prediction in addition to intra-frame prediction as a P-slice.
  • a slice including an MB that can be predicted using a combined image made up with a plurality of image frames is referred to as a B-slice.
  • An image frame composed of I-slices solely is referred to as an I-picture
  • an image frame containing I-slices or P-slices (excluding B-slices) is referred to as a P-picture
  • an image frame containing B-slices is referred to as a B-picture.
  • the motion vector calculating apparatus E109 looks up the original image stored in the MB buffer E101 and a reconstructed image stored in the frame buffer E106, and detects parameters (candidate reference index candidate_ref_idx and candidate motion vector candidate_mv) associated with the aforementioned plurality of types of prediction methods.
  • the MB mode deciding apparatus E110 uses the candidate reference index candidate_ref_idx and candidate motion vector candidate_mv detected by the motion vector calculating apparatus E109 to select a suitable one of the types of prediction for encoding an MB to be encoded (MB mode mb_mode).
  • the selected MB mode mb_mode, and its corresponding reference index ref_idx and motion vector mv are entropy-encoded by the entropy coding apparatus E104.
  • the prediction apparatus E107 generates a predicted value corresponding to the MB mode mb_mode selected by the MB mode deciding apparatus E110, its corresponding reference index ref_idx and motion vector mv, from the reconstructed image stored in the frame buffer E106.
  • the predictive error is converted into a value in the frequency domain by the conversion apparatus E102.
  • the predictive error converted into the frequency domain is quantized by the quantization apparatus E103 with a quantization step size corresponding to a quantization parameter QP supplied by the code-amount control apparatus E108.
  • the quantization parameter QP and quantized predictive error (quantization level) are entropy-encoded at the entropy coding apparatus E104 (Note that according to AVC, the quantization parameter can be defined on an MB-by-MB basis).
  • the above-described quantization level is subjected to inverse quantization and inverse conversion by the inverse quantization/inverse conversion apparatus E105, and brought back to its original spatial domain.
  • the predictive error brought back to the spatial domain is added with the predicted value supplied by the prediction apparatus E107, and the result is stored in the frame buffer E106 as a reconstructed image for subsequent encoding.
  • the conventional moving picture encoding apparatus performs encoding processing by applying the aforementioned processing to each MB in each input image frame.
  • the skip MB mode is an MB mode in which the need for entropy-encoding of the reference index, motion vector, and quantization level for transmission is eliminated.
  • a skip MB mode in which the condition of spatially adjacent already-encoded blocks (context) is used to generate a reference index skip_ref_idx and a motion vector skip_mv for a skip MB is generally referred to as a P skip MB mode.
  • the P skip MB mode eliminates the need for entropy-encoding of the reference index, motion vector, and quantization level for transmission.
  • the P skip MB mode tends to be selected as an MB mode suitable for encoding in a region that is flat and is likely to have a smaller predictive error.
  • a cause of the problem lies in median prediction for a motion vector, and a rule of generation of the reference index and motion vector for the P skip MB mode.
  • the median prediction for a motion vector, and rule of generation of the reference index and motion vector for the P skip MB mode according to AVC, which constitute the cause, will be described hereinbelow (see Non-patent Document 1: ISO/IEC 14496-10 Advanced Video Coding for further information).
  • median prediction for a motion vector motion vectors of three blocks adjacent to a block to be processed are looked up, and a motion vector having a median value among them is defined as a predicted motion vector (pmv).
  • the three blocks adjacent to the block to be processed are a left adjacent block (block A), an upper adjacent block (block B), and an upper-right or upper-left adjacent block (block C or block D).
  • Median prediction for a motion vector for a 16x16 block size (MB) corresponding to a reference index ref_idx will now be described with reference to FIG. 3 . Note that the predicted motion vector is used in predictive encoding of a motion vector.
  • MEDIAN (a, b, c) designates a function that returns a median value of input a, b, c
  • p16mv designates a predicted motion vector of an MB with respect to a reference index ref_idx
  • ref_idx_X designates a reference index of an adjacent block X
  • mv_X designates a motion vector of the adjacent block X
  • avail_flag_X designates an availability flag of the adjacent block X.
  • the availability flag avail_flag_X of the adjacent block X is defined to have a value of False when the block X lies outside a picture or belongs to another slice. Otherwise, avail_flag_X is defined to have a value of True.
  • a reference index skip_ref_idx is defined as zero.
  • a motion vector skip_mv is defined as zero vector when a zero vector is present in an adjacent block (having a value of zero for the motion vector in its horizontal and vertical components), or when the MB to be encoded lies at the boundary of pictures or of slices (with the proviso that it lies on the left or upper edge), which is regarded as having no significant motion.
  • the P skip MB mode with a zero vector consecutively appears in a flat region in which the P skip MB mode is likely to be selected, and a motion vector of zero vector propagates in a rightward and downward direction of the picture plane.
  • the motion vector for the P skip MB mode is always a zero vector at the boundary of pictures or of slices, which is looked up in prediction of the motion vector, and therefore, an effect of the motion vector on the vector field in the picture plane is significant.
  • a frame to be encoded is vertically planned, most of the image region is flat (with flat-textured MB's), and a motion vector that matches panning is obtained by motion vector calculation only from MB's with texture (highly texture MB's).
  • the present invention has been made in view of such a problem, and its object is to provide a moving picture encoding method, and an apparatus and a computer program using the same, with which generation of a subjectively undesirable vector field is avoided, enabling encoding with high image quality.
  • a first invention for solving the aforementioned problem is a moving picture encoding method, characterized in that the method includes: an inter-frame prediction step of applying inter-frame prediction to an image on a block-by-block basis; a motion vector calculating step of calculating a reference frame and a motion vector for use in inter-frame prediction of the above-described block; a predicted motion vector calculating step of calculating a predicted motion vector for prediction encoding of a motion vector of the above-described block; a skip mode motion vector calculating step of calculating a skip mode motion vector for a skip mode using a context of blocks spatially adjacent to the above-described block; and a skip mode validity deciding step of deciding whether the skip mode is valid as an encoding mode for the above-described block, wherein the above-described skip mode validity deciding step uses a corrective value based on the above-described skip mode motion vector for the skip mode validity decision.
  • a second invention for solving the aforementioned problem is, in the aforementioned first invention, characterized in that the above-described skip mode validity deciding step uses for the skip mode validity decision a value obtained by weighting, with a quantization parameter of the above-described block, a code-amount of a differential motion vector between the above-described skip mode motion vector and the above-described predicted motion vector corresponding to a reference frame for the above-described skip mode.
  • a third invention for solving the aforementioned problem is, in the aforementioned second invention, characterized in that the above-described skip mode validity deciding step decides that the skip mode is invalid as an encoding mode for the above-described block in a case that the reference frame for the above-described skip mode is different from a reference frame calculated at the above-described motion vector calculating step.
  • a fourth invention for solving the aforementioned problem is, in the aforementioned second invention, characterized in that the above-described skip mode motion vector calculating step defines the skip mode motion vector as zero vector in a case that the above-described block lies at a boundary of pictures or of slices, and the above-described skip mode validity deciding step decides that the skip mode is invalid in a block lying at a boundary of pictures or of slices.
  • a fifth invention for solving the aforementioned problem is, in the aforementioned first invention, characterized in that the above-described skip mode validity deciding step uses for the skip mode validity decision a value obtained by weighting, with a quantization parameter of the above-described block, a code-amount of a differential motion vector between the above-described skip mode motion vector and the motion vector calculated at the above-described motion vector calculating step corresponding to a reference frame for the above-described skip mode.
  • a sixth invention for solving the aforementioned problem is, in the aforementioned fifth invention, characterized in that the above-described skip mode validity deciding step decides that the skip mode is invalid as an encoding mode for the above-described block in a case that the reference frame for the above-described skip mode is different from a reference frame calculated at the above-described motion vector calculating step.
  • a seventh invention for solving the aforementioned problem is, in the aforementioned fifth invention, characterized in that the above-described skip mode motion vector calculating step defines the skip mode motion vector as zero vector in a case that the above-described block lies at a boundary of pictures or of slices, and the above-described skip mode validity deciding step decides that the skip mode is invalid in a block lying at a boundary of pictures or of slices.
  • An eighth invention for solving the aforementioned problem is a moving picture encoding apparatus, characterized in that the apparatus includes: inter-frame prediction means for applying inter-frame prediction to an image on a block-by-block basis; motion vector calculating means for calculating a reference frame and a motion vector for use in inter-frame prediction of the above-described block; predicted motion vector calculating means for calculating a predicted motion vector for prediction encoding of a motion vector of the above-described block; skip mode motion vector calculating means for calculating a skip mode motion vector for a skip mode using a context of blocks spatially adjacent to the above-described block; and skip mode validity deciding means for deciding whether the skip mode is valid as an encoding mode for the above-described block, wherein the above-described skip mode validity deciding means uses a corrective value based on the above-described skip mode motion vector for the skip mode validity decision.
  • a ninth invention for solving the aforementioned problem is, in the aforementioned eighth invention, characterized in that the above-described corrective value is a value obtained by weighting, with a quantization parameter of the above-described block, a code-amount of a differential motion vector between the above-described skip mode motion vector and the above-described predicted motion vector corresponding to a reference frame for the above-described skimp mode.
  • a tenth invention for solving the aforementioned problem is, in the aforementioned ninth invention, characterized in that the above-described skip mode validity deciding means decides that the skip mode is invalid as an encoding mode for the above-described block in a case that the reference frame for the above-described skip mode is different from a reference frame calculated by the above-described motion vector calculating means.
  • An eleventh invention for solving the aforementioned problem is, in the aforementioned ninth invention, characterized in that the above-described skip mode motion vector calculating means defines the skip mode motion vector as zero vector in a case that the above-described block lies at a boundary of pictures or of slices, and the above-described skip mode validity deciding means decides that the skip mode is invalid in a block lying at a boundary of pictures or of slices.
  • a twelfth invention for solving the aforementioned problem is, in the aforementioned eighth invention, characterized in that the above-described corrective value is a value obtained by weighting, with a quantization parameter of the above-described block, a code-amount of a differential motion vector between the above-described skip mode motion vector and the motion vector calculated by the above-described motion vector calculating means corresponding to a reference frame for the above-described skip mode.
  • a thirteenth invention for solving the aforementioned problem is, in the aforementioned twelfth invention, characterized in that the above-described skip mode validity deciding means decides that the skip mode is invalid as an encoding mode for the above-described block in a case that the reference frame for the above-described skip mode is different from a reference frame calculated by the above-described motion vector calculating means.
  • a fourteenth invention for solving the aforementioned problem is, in the aforementioned twelfth invention, characterized in that the above-described skip mode motion vector calculating means defines the skip mode motion vector as zero vector in a case that the above-described block lies at a boundary of pictures or of slices, and the above-described skip mode validity deciding means decides that the skip mode is invalid in a block lying at a boundary of pictures or of slices.
  • a fifteenth invention for solving the aforementioned problem is a program for a moving picture encoding apparatus, characterized in that the above-described program causes the above-described moving picture encoding apparatus to function as: inter-frame prediction means for applying inter-frame prediction to an image on a block-by-block basis; motion vector calculating means for calculating a reference frame and a motion vector for use in inter-frame prediction of the above-described block; predicted motion vector calculating means for calculating a predicted motion vector for prediction encoding of a motion vector of the above-described block; skip mode motion vector calculating means for calculating a skip mode motion vector for a skip mode using a context of blocks spatially adjacent to the above-described block; and skip mode validity deciding means for deciding whether the skip mode is valid as an encoding mode for the above-described block, and causes the above-described skip mode validity deciding means to function to use a corrective value based on the above-described skip mode motion vector for the skip mode validity decision.
  • a sixteenth invention for solving the aforementioned problem is, in the aforementioned fifteenth invention, characterized in that the program causes the above-described skip mode validity deciding means to function to use for the skip mode validity decision a value obtained by weighting, with a quantization parameter of the above-described block, a code-amount of a differential motion vector between the above-described skip mode motion vector and the above-described predicted motion vector corresponding to a reference frame for the above-described skip mode.
  • a seventeenth invention for solving the aforementioned problem is, in the aforementioned sixteenth invention, characterized in that the above-described skip mode validity deciding means decides that the skip mode is invalid as an encoding mode for the above-described block in a case that the reference frame for the above-described skip mode is different from a reference frame calculated by the above-described motion vector calculating means.
  • An invention for solving the aforementioned problem is, in the aforementioned sixteenth invention, characterized in that the above-described skip mode motion vector calculating means defines the skip mode motion vector as zero vector in a case that the above-described block lies at a boundary of pictures or of slices, and the above-described skip mode validity deciding means decides that the skip mode is invalid in a block lying at a boundary of pictures or of slices.
  • a nineteenth invention for solving the aforementioned problem is, in the aforementioned fifteenth invention, characterized in that the program causes the above-described skip mode validity deciding means to function to use for the skip mode validity decision a value obtained by weighting, with a quantization parameter of the above-described block, a code-amount of a differential motion vector between the above-described skip mode motion vector and the motion vector calculated by the above-described motion vector calculating means corresponding to a reference frame for the above-described skip mode.
  • a twentieth invention for solving the aforementioned problem is, in the aforementioned nineteenth invention, characterized in that the above-described skip mode validity deciding means decides that the skip mode is invalid as an encoding mode for the above-described block in a case that the reference frame for the above-described skip mode is different from a reference frame calculated by the above-described motion vector calculating means.
  • the twenty-first invention for solving the aforementioned problem is, in the aforementioned nineteenth invention, characterized in that the above-described skip mode motion vector calculating means defines the skip mode motion vector as zero vector in a case that the above-described block lies at a boundary of pictures or of slices, and the above-described skip mode validity deciding means decides that the skip mode is invalid in a block lying at a boundary of pictures or of slices.
  • a moving picture encoding method and an apparatus and a computer program using the same, with which generation of a subjectively undesirable vector field is avoided, enabling encoding with high image quality.
  • the present invention relates only to a validity decision technique for a skip MB mode in a moving picture encoding technique using motion-compensated prediction.
  • a moving picture encoding apparatus using the present invention only the configuration and operation of the MB mode deciding apparatus E110 are different from those in the whole conventional apparatus in FIG. 2 .
  • the MB mode deciding apparatus E110 in the conventional scheme will be addressed in detail, and thereafter, several embodiments of the present invention will be explained.
  • the conventional MB mode deciding apparatus is comprised of a motion-compensated prediction apparatus E11001, an SATD calculating apparatus E11002, a skip MB motion vector calculating apparatus E11003, a predicted motion vector calculating apparatus E11004, a vector cost calculating apparatus E11005, a deciding apparatus E11006, and a switch SW11001.
  • the motion-compensated prediction apparatus E11001 generates an inter-frame predicted image corresponding to input reference index and motion vector with switching at the switch SW11001 between a candidate reference index candidate_ref_idx and a candidate motion vector candidate_mv (candidate_mv_x, candidate_mv_y) supplied by the external motion vector calculating apparatus E109, and a reference index skip_ref_idx and a motion vector skip_mv (skip_mv_x, skip_mv_y) for a skip MB supplied by the skip MB motion vector calculating apparatus E11003.
  • MC(ref_idx,mv_x,mv_y) is a function for calculating, according to the supplied reference index ref_idx and motion vector (mv_x,_mv_y), an inter-frame predicted image from a reconstructed image frame at the reference index ref_idx using coordinates (x,y) at an upper left corner and the motion vector (mv_x, mv_y) of a block to be prediction-processed.
  • pixel precision for a motion vector mv is 1/4-pixel precision.
  • idx designates an index of a 4x4 block within an MB as shown in FIG. 1
  • 0 ⁇ b ⁇ 4 ⁇ y idx ⁇ 12 represents coordinates at an upper left corner of the 4x4 block corresponding to idx within the MB.
  • the skip MB motion vector calculating apparatus E11003 calculates a reference index skip_ref_idx and a motion vector skip_mv (skip_mv_x, skip_mv_y) corresponding to a skip MB, details of which follow the description in the section of PROBLEMS TO BE SOLVED BY THE INVENTION.
  • the predicted motion vector calculating apparatus E11004 calculates a predicted motion vector pmv (pmv_x, pmv_y) corresponding to the candidate reference index candidate_ref_idx, details of which follow the description in the section of PROBLEMS TO BE SOLVED BY THE INVENTION.
  • the vector cost calculating apparatus E11005 subtracts the predicted motion vector pmv (pmv_x, pmv_y) supplied by the predicted motion vector calculating apparatus E11004 from the candidate motion vector candidate_mv (candidate_mv_x, candidate_mv_y) to determine a differential motion vector dmv (dmv_x, dmv_y), and a code-amount dmv_bit of the differential motion vector dmv.
  • Bit_length(x) is a function that returns the number of bits in entropy encoding of a differential motion vector x.
  • the vector cost calculating apparatus E11005 applies a weight using a quantization parameter QP supplied by the external code-amount control apparatus E108 to the aforementioned code-amount dmv bit according to EQ. (7) below, and supplies the result of weighting to the deciding apparatus E11006 as a vector cost mv_cost.
  • mv_cost 2 ( QP - 12 ) / 6 ⁇ dmv_bit
  • the deciding apparatus E11006 decides that the skip MB is valid in a case that the cost smb_cost for the skip MB mode is smaller than the cost mb_cost for an MB mode other than the skip MB mode, and outputs mb_mode, a reference index ref_idx, and a motion vector mv corresponding to the skip MB mode to the external. Otherwise, it outputs mb_mode, a reference index ref_idx, and a motion vector mv corresponding to an MB mode other than the skip MB mode to the external.
  • the skip MB mode is decided to be valid among other MB mode.
  • the P skip MB mode having a motion vector inconsistent with motion of panning is selected, resulting in generation of a subjectively undesirable vector field.
  • the present invention employs a corrective value based on the motion vector for the skip MB mode to make validity decision of the skip MB mode.
  • the corrective value is a hypothetical vector cost obtained by weighting, with a quantization parameter of the current block, a code-amount calculated from a differential motion vector between the motion vector for the skip MB mode and the estimated motion vector. In this way, generation of a subjectively undesirable vector field can be avoided.
  • a first embodiment includes means for determining a hypothetical vector cost from a code-amount of a differential motion vector between the motion vector for the skip MB mode and the predicted motion vector corresponding to a reference frame (reference index) for the skip MB mode.
  • the hypothetical vector cost can be employed in validity decision for the skip MB mode to overcome the aforementioned problem.
  • the hypothetical vector cost calculating apparatus P10000 subtracts the predicted motion vector pmv16 (pmv16_x, pmv16_y) supplied by the predicted motion vector calculating apparatus E11004 from the motion vector skip_mv (skip_mv_x, skip_mv_y) corresponding to the skip MB to determine a hypothetical differential motion vector sdmv (sdmv_x, dmv_y), and a hypothetical code-amount sdmv_bit of the differential motion vector sdmv.
  • the hypothetical vector cost smv_cost in EQ. (11) serves as an offset for preventing the skip MB mode from being selected to generate a subjectively undesirable vector field.
  • the deciding apparatus E11006 of the present invention employs the SATD supplied by the SATD calculating apparatus E11002 corresponding to the candidate reference index candidate_ref_idx and candidate motion vector candidate__mv, and the vector cost mv_cost supplied by the vector cost calculating apparatus E11005 via the switch SW11002, to calculate a cost mb cost for the MB mode according to EQ. (8), as in the conventional technique.
  • the deciding apparatus E11006 decides that the skip MB is valid if the cost smb_cost for the skip MB mode is smaller than the cost mb_cost for the MB mode other than the skip MB mode as in the conventional technique, and outputs the mb_mode, reference index ref_idx, and motion vector mv corresponding to the skip MB mode to the external. Otherwise, it outputs the mb_mode, reference index ref_idx, and motion vector mv corresponding to the MB mode other than the skip MB mode to the external.
  • an initial value (a sufficiently large value) is first set into a minimum cost MinCost.
  • Step S1000 a decision is made as to whether an object to be decided is the skip MB. If it is not the skip MB, the process goes to Step S2000; otherwise, to Step S3000.
  • Step S2000 the reference index ref_idx and motion vector mv corresponding to the MB mode to be decided are employed to calculate an MB mode cost mb_cost according to EQ. (8), which is set into a variable curCost, and the process then goes to Step S4000.
  • Step S3000 the reference index ref_idx and motion vector mv corresponding to the skip MB mode are employed to calculate a skip MB mode cost smb_cost according to EQ. (12), which is set into a variable curCost, and the process then goes to Step S4000.
  • Step S4000 a decision is made as to whether the variable curCost is smaller than the minimum cost MinCost. If it is smaller, the process goes to Step S5000; otherwise, to Step S6000.
  • Step S5000 the minimum cost MinCost is updated using the variable curCost, and mb_mode for the current MB mode to be decided, its corresponding reference index ref_idx and motion vector mv are stored (an encoding MB mode to be selected is updated). Then, the process goes to Step S6000.
  • Step S6000 a decision is made as to whether comparison is completed for all MB modes. If comparison is not completed for all MB modes, mb_mode for a next MB mode to be decided is set and the process goes back to Step S1000. If comparison is completed for all MB modes, the MB mode decision is terminated.
  • the MB mode deciding apparatus Upon termination of the MB mode decision, the MB mode deciding apparatus outputs the currently held mb_mode, reference index ref_idx, and motion vector mv as parameters for encoding the current MB to the external.
  • a second embodiment includes means for determining a hypothetical vector cost from the code-amount of a differential motion vector between the motion vector for the skip MB mode and the motion vector corresponding to the reference frame (reference index) for the skip MB mode calculated by the motion vector calculating apparatus.
  • the apparatus of the present embodiment is different in that the candidate motion vector, instead of the predicted motion vector, is supplied to the hypothetical vector cost calculating apparatus P10000.
  • the operation of the hypothetical vector cost calculating apparatus P10000 is different from that in the first embodiment.
  • the hypothetical vector cost calculating apparatus P10000 employs the quantization parameter QP supplied by the external code-amount control apparatus E108, motion vector skip_mv corresponding to the skip MB supplied by the skip MB motion vector calculating apparatus E11003, and candidate reference index ref_idx16 and candidate motion vector mv16 for the inter-frame prediction mode corresponding to the 16x16 block size supplied by the external motion vector calculating apparatus E109, to calculate a hypothetical vector cost smv_cost.
  • the hypothetical vector cost calculating apparatus P10000 subtracts the motion vector mv16 (pmv16_x, pmv16_y) supplied by the motion vector calculating apparatus E109 from the motion vector skip_mv (skip_mv_x, skip_mv_y) corresponding to the skip MB to determine a hypothetical differential motion vector pdmv (pdmv_x, pdmv_y), and a hypothetical code-amount pdmv__bit of the differential motion vector pdmv.
  • an initial value (a sufficiently large value) is first set into a minimum cost MinCost.
  • Step S1000 a decision is made as to whether an object to be decided is the skip MB. If it is not the skip MB, the process goes to Step S2000; otherwise, to Step S3000.
  • Step S2000 the reference index ref_idx and motion vector mv corresponding to the MB mode to be decided are employed to calculate an MB mode cost mb_cost according to EQ. (8), which is set into a variable curCost, and the process then goes to Step S4000.
  • Step S3000 the reference index ref_idx and motion vector mv corresponding to the skip MB mode are employed to calculate a skip MB mode cost smb_cost according to EQ. (15), which is set into a variable curCost, and the process then goes to Step S4000.
  • Step S4000 a decision is made as to whether the variable curCost is smaller than the minimum cost MinCost. If it is smaller, the process goes to Step S5000; otherwise, to Step S6000.
  • Step S5000 the minimum cost MinCost is updated using the variable curCost, and mb_mode for the current MB mode to be decided, its corresponding reference index ref_idx and motion vector mv are stored (an encoding MB mode to be selected is updated). Then, the process goes to Step S6000.
  • Step S6000 a decision is made as to whether comparison is completed for all MB modes. If comparison is not completed for all MB modes, mb_mode for a next MB mode to be decided is set and the process goes back to Step S1000. If comparison is completed for all MB modes, the MB mode decision is terminated.
  • the MB mode deciding apparatus Upon termination of the MB mode decision, the MB mode deciding apparatus outputs the currently held mb_mode, reference index ref_idx, and motion vector mv as parameters for encoding the current MB to the external.
  • a third embodiment includes means for deciding whether the skip MB, mode is valid by comparing the reference frame (reference index ref_idx16) calculated by the motion vector calculating apparatus with the reference frame (skip reference index skip_ref_idx) for the skip MB mode.
  • the apparatus of the present embodiment is different in that the candidate reference index calculated by the motion vector calculating apparatus E109 is supplied to the deciding apparatus E11006.
  • the operation of the deciding apparatus E11006 is different from that in the first embodiment.
  • the P skip MB mode causing a subjectively undesirable motion vector is prevented with higher accuracy from being inappropriately selected.
  • Step S7000 is additionally introduce.
  • an initial value (a sufficiently large value) is first set into a minimum cost MinCost.
  • Step S1000 a decision is made as to whether an object to be decided is the skip MB. If it is not the skip MB, the process goes to Step S2000; otherwise, to Step S7000.
  • Step S2000 the reference index ref_idx and motion vector mv corresponding to the MB mode to be decided are employed to calculate an MB mode cost mb_cost according to EQ. (8), which is set into a variable curCost, and the process then goes to Step S4000.
  • Step S3000 the reference index ref_idx and motion vector mv corresponding to the skip MB mode are employed to calculate a skip MB mode cost smb_cost according to EQ. (12), which is set into a variable curCost, and the process then goes to Step S4000.
  • Step S4000 a decision is made as to whether the variable curCost is smaller than the minimum cost MinCost. it is smaller, the process goes to Step S5000; otherwise, to Step S6000.
  • Step S5000 the minimum cost MinCost is updated using the variable curCost, and mb_mode for the current MB mode to be decided, its corresponding reference index ref_idx and motion vector mv are stored (an encoding MB mode to be selected is updated). Then, the process goes to Step S6000.
  • Step S6000 a decision is made as to whether comparison is completed for all MB modes. If comparison is not completed for all MB modes, mb_mode for a next MB mode to be decided is set and the process goes back to Step S1000. If comparison is completed for all MB modes, the MB mode decision is terminated.
  • the MB mode deciding apparatus Upon termination of the MB mode decision, the MB mode deciding apparatus outputs the currently held mb_mode, reference index ref_idx, and motion vector mv as parameters for encoding the current MB to the external.
  • the configuration of the MB mode deciding apparatus is that as shown in FIG. 16 . It will be easily recognized that this embodiment may be suitably applied to validity decision of a direct mode for B-slices (see Non-patent Document 1: ISO/IEC 14496-10 Advanced Video Coding for further information).
  • a fourth embodiment includes means for deciding whether the skip MB mode is valid by deciding whether the current MB, lies at the boundary of pictures or of slices referring to the MB address.
  • the apparatus of the present embodiment is different in that the MB address is supplied to the deciding apparatus E11006.
  • the operation of the deciding apparatus E11006 is different from that in the first embodiment.
  • the deciding apparatus E11006 decides whether the current MB lies at the boundary of pictures or of slices referring to the supplied MB address, and if the current MB lies at the boundary of pictures or of slices, it makes control to prevent the skip MB mode from becoming the encoding mode mb_mode for the MB.
  • the motion vector for the P skip MB mode is always a zero vector at the boundary of pictures or of slices, and the motion vector of an MB lying at the boundary of pictures or of slices is looked up in prediction of the motion vector in subsequent encoding; therefore, an effect of the motion vector of an MB lying at the boundary of pictures or of slices on the vector field in the picture plane is significant.
  • Step S8000 is additionally introduced.
  • an initial value (a sufficiently large value) is first set into a minimum cost MinCost.
  • Step S1000 a decision is made as to whether an object to be decided is the skip MB. If it is not the skip MB, the process goes to Step S2000; otherwise, to Step S7000.
  • Step S2000 the reference index ref_idx and motion vector mv corresponding to the MB mode to be decided are employed to calculate an MB mode cost mb_cost according to EQ. (8), which is set into a variable curCost, and the process then goes to Step S4000.
  • Step S8000 referring to the supplied MB address, a decision is made as to whether the current MB lies at the boundary of pictures or of slices referring to the MB address. If the current MB lies at the boundary of pictures or of slices, the process goes to Step S6000; otherwise, to Step S3000.
  • Step S3000 the reference index ref_idx and motion vector mv corresponding to the skip MB mode are employed to calculate a skip MB mode cost smb_cost according to EQ. (12), which is set into a variable curCost, and the process then goes to Step S4000.
  • Step S4000 a decision is made as to whether the variable curCost is smaller than the minimum cost MinCost. If it is smaller, the process goes to Step S5000; otherwise, to Step S6000.
  • Step S5000 the minimum cost MinCost is updated using the variable curCost, and mb_mode for the current MB mode to be decided, its corresponding reference index ref_idx and motion vector mv are stored (an encoding MB mode to be selected is updated). Then, the process goes to Step S6000.
  • Step S6000 a decision is made as to whether comparison is completed for all MB modes. If comparison is not completed for all MB modes, mb_mode for a next MB mode to be decided is set and the process goes back to Step S1000. If comparison is completed for all MB modes, the MB mode decision is terminated.
  • the MB mode deciding apparatus Upon termination of the MB mode decision, the MB mode deciding apparatus outputs the currently held mb_mode, reference index ref_idx, and motion vector mv as parameters for encoding the current MB to the external.
  • the configuration of the MB mode deciding apparatus is that as shown in FIG. 19 .
  • An information processing system shown in FIG. 20 consists of a processor A1001, a program memory A1002, and storage media A1003 and A1004.
  • the storage media A1003 and A1004 may be separate storage media, or storage regions comprised in the same storage medium.
  • a magnetic storage medium such as a hard disk may be employed.

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